I think I lucked out, most of the adhesive that was on there came away with the heatsink not on the FETs. I'm a little worried about scraping on them, but I'll clean them the best I can. I also tested it and the MM is still working correctly. I didn't run it much, but I checked all the funtions.

I found the Alumina here so I think I'm going to order some tonight.

The idea is for the heatsink to sit on top of the epoxy and not touch the FETs right? You don't want there to be a chance for the heatsink aluminum to conduct electricity across the FETs right? Or is it sfe to just put it on then push the heatsink down into it?